128, if your going to get a 256 card you might as well get a card that cna actually use it well (aka, Geforce 6,X800). THe 9800 series aren't fast enough to fully use the extra memory.
128MB offers the best value on the 9800 line. 256MB is only really nec'y in newer games at 12x9+ with AA, and only the GF 6 and Radeon X series are fast enough to be playable at those settings.
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